imRel0ad, the leader of Pwn Dev Team who created Ac1dSn0w jailbreak, has tweeted that Ac1dsn0w untethered is coming soon:

I just had a talk with @pod2g via email. Such a nice guy! He will share with us his iOS 5 untethered exploit. Ac1dsn0w untethered is coming!

For those who are not familiar, Ac1dsn0w is a jailbreak tool developed by Pwn Dev team, released late last year. Ac1dSn0w is currently available for Mac OS only.

Since Ac1dsn0w offers no advantage over RedSn0w, PwnageTool of Sn0wbreeze, so we don’t see any reason for another new jailbreak tool for iOS 5.0.1 when RedSn0w is already there for you, for both Windows and Mac. Most likely it will bring A4 support only.